Rotary pump



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Sept 2Q, E932. w. LANDENBERGER ROTARY PUMP Filed April Y25., 193l 2 Sheets-Sheet l Spia 25v E932m H. LANDENEERGER 393739362 Filed' April 25, 1951 2 Sheets-Sheet 2 Patented Sept.. 20, 1932 HENRY 'W'. LANDEN BERGER, OF PHILADELPHIA, EENNSYLVANIA, ASSIGNOR T0 AMEN- ICAN FLUID MOTORS COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COE: "e

TION OF PENNSYLVANIA ORA- ROTARY PUMP Application led April 25, 1881. Serial No. 532,917.

This invention relates to improvements in rotary pumps of the general type disclosed the central stationary valve and the pump rotor, all as hereinafter set forth and illustrated in the attached drawings, in which:

Figure 1 is a vertical sectional view through a pump made in accordance with my invention;

Fig. 2 is a view illustrating the central valve;

Fig. 3 is a section on the line 3-3, Fig. 2, and

Fig. 4 is a-section on the line 4-4, Fig. 2.

With reference to the drawings, a pump made in accordance with my invention may comprise a casing 1 within which upon vbearings 2 is mounted a rotor 3, said rotor comprising a circumferential series of radial cylinders 4 each provided with a plunger 5. Each of the plungers is pivotally connected to a slipper 6, and these slippers are slidably secured between annular guides 7, 7 and against the inner face of a ring 8 which constitutes the inner race for a series of roller bearings 9, the latter being confined b an outer race 10. The outer race is mounted7 in a floating ring 11 which in tu'rn is mounted in transverse guides in the casing 1 and is provided with means whereby it may be `adjusted in the guides to vary its eccentricity with respect to the axis of the rotor 3. The adjusted position of the iioating ring 11 determines the direction of discharge of the pump and also "V the rate of discharge, as hereinafter set forth. The rotor 3 is operated in its bearings through the medium of a shaft 12 secured to the rotor by means in the present instance of bolts 13, a bearing 14 being provided in the casing l for the said shaft, as illustrated in Fig. 1.

The pump further comprises a central valve l5, the inner end 16 of which is cylindrical in form and fits the hollow interior of the rotor 3. As shown in Fig. 3, portions of the inner end` 16 of the valve opposite the inner ends of the rotor cylinders 4 are cut away to` form a pair of oppositely arranged recesses,'55 17 and 18 respectively, both of which communicate with the inner ends of the cylinders 4. The recess 17 is in communication with a pair of ports 19 which extend longitudinally through the valve 15 and communicate with a@ a recess 20 in the outer portion of the valve body, while a corresponding set of orts 19a establish communication between t e recess 18 and a recess 21 in the outer end of the valve diametrically opposite to the recess 20. The recesses 2O and 21 respectively communicate with ports 22 and 23 in the casing 1. The

valve 15 is secured in the casing by means of a nut 24 on the threaded extension 25 of the valve, see Fig. 1.

It will be apparent that as the rotor 3 is rotated, the cylinders at opposite sides thereof are in communication respectively with the recesses 17 and 18, and the eccentric adjustment is such that when the pistons of the cylinders communicating with the recess 17 are moving in one direction, in or-out, the pistons of the cylinders communicating with the recess 18 are moving in the opposite phase with respect to their cylinders, depending upon the position of the floating ring with respect to the axis of the rotor. When the floating ring is in the concentric position, the pistons remain stationary in the cylinders, and obviously as the eccentricity in either direction increases, the rate of discharge of the pump increases correspondingly.

The pump assembly and its mode of operation are well understood in the art and need oo no further description.

In pumps of this character, the projecting or inner portion 16 of the valve inds no support other than in the cantilever eiect, and by reason of the fact that the pump pres- 95 sure is always applied to one side 'of the valve member, whereas the other side is subjected to the eect of suction, there is a continual tendency during operation for this portion 16 of the valve to deflect into frictional contact 1ct' with the rotating member 3. Since extremein the surface of the portion 16 of the valve a series of tapered recesses 25 and 26, the recesses 25 being located at that side of the valve corresponding to the cut-out portion 17, and the recesses 26 being on the opposite side of the valve in which is formed the cut-out 18. The recesses preferably are formed as illustrated in Fig. 2, each being provided with a portion 27 extending in a direction circumferentially of the valve body, and a transverse adjoining portion 28 extending in the axial direction. Preferably also the recesses decrease in depth from the outer end of the portion 27 to the opposite side or end of the portion 28 so that they are in effect wedge-shape. The outer end of each of At-he arms 2,7 of the recesses 25 is connected through ports 31 and 32 respectively with the ports 19a, while the corresponding ends of the portions 27 of the recesses 26 are similarly connected through ports 33 with the ports 19. Thus, the two pairs of recesses 25 and 26 are respectively connected to those of the ports 19 and 19a which occupy positions at the opposite side of the valve body, and accordingly when either of the sets of ports 19 or 19a is connected with the pressure side of the pump, the iuid pressure is transmitted through the appropriate ports and recesses to the opposite side of the valve body. The oil passing into the recesses forms in effect wedge-shaped bodies whichare forcibly drawn towards the shallow ends of the recesses by action of the rotating cylinder body and tend to lift the valve away from the said cylinder body, thereby neutralizing the aforementioned tendency of the valve to deiect from the true axially aligned position.

It will be noted that the wedges of the respective pairs 25 and 26 extend in opposite directions, so that the system is effective regardless of the direction of the relative rotation of the parts.

The invention is applicable in principle to other forms of pump or mechanisms having a corresponding relation of relatively moving parts.

I claim:

n 1. In combination, a casing, a valve member fixed in said casing and having a cylindrical terminal portion,` ports at opposite sides of said terminal portion, `a cylinder body mounted in said casing and adapted for rotation around the terminal portion of the valve member, said body having a plurality of radial cylinders arranged for communication with the said ports, plungers in said cylinders, and means operative-by rotation of the cylinder body to actuate the plungers whereby the plungers withdraw a fluid from one of said valve ports and discharge the uid into the other of said ports, and recesses in said valve body on the opposite sides thereof from the respective ports and each connected with the port on the opposite side whereby fluid pressure applied to either port will be conducted to the recess at the opposite side of the valve, said recesses tapering asto depth in the' direction of rotation of said cylinder body.

2. In combination, a casing, a valve member in said casing having' a projecting cylindrical terminal portion, said terminal portion having ports at opposite sides thereof, means embracing and relatively movable with respect to said terminal portion, means for applying fluid pressure to one of said ports and suction to the other of said ports, a

kcavity formed between the said valve and the said embracing means on the side of said valve opposite the pressure port, and a channel connecting the said pressure port with said@ cavity whereby iuid pressure is transmitted to the cavity to exert a pressure between the valve and the said embracing means tending to oppose deiiection of the said terminal portion of the valve due to unbalanced fluid pressures at the opposite ports, said cavity tapering as to depth in the direction of movement of said embracing bracing said cylindrical valve and said ports,

means for applying pressure to one and suction to the other of said ports, a recess in the face of said 'valve and on the side thereof opposite the pressure port, and a channel connecting said recess with said pressure port, said recess tapering in the direction of rotation of said rotary element.

4. In combination, a cylindrical valve member having ports in opposite sides thereof, and means for supporting said member at one end only, of means closely embracing and rotatable about the cylindrical valve for applying fluid pressure at one of said ports and suction at the other, and means for neutralizing the effects of the unbalanced fluid pressures at the opposite sides of the valve including a tapered recess in the face of the valve on the opposite side thereof with respect tosaid pressure port, and a channel connectingther pressure port with said recess.

5. In combination, a cylindrical valve member having ports in opposite sides thereof, and means for supporting said member at one end only, of means closely embracing and rotatable about the cylindrical valve for applying fluid pressure at one of said ports and suction at the other, and means for neutralizing the effects of the unbalanced fluid pressures at opposite sides of the valve including a recess in the face of the valve on the opposite sid-e thereof with respect to said pressure port, said recess tapering in the direction of rotation of the said embracing means, and a channel connecting the pressure port With saidrecess.

6. In combination, a valve member having ports at opposite sides, a member closely embracing said opposite sides of said valve and movable with respect thereto, and means for applying Huid pressure to the port at one side of said valve and evacuating the port at the opposite side, a recess in the surface of said valve on the suction side thereof, said recess underlying the embracing member, and a channel connecting said recess with the pressure port, said recess tapering in the direction of movement of said member.

7. In combination, a valve member having ports at opposite sides, a member closely embracing said opposite sides of said valve and movable with respect thereto, and means associated with said member for applying fluid pressure to the port at one side of said valve and evacuating the port at the opposite side, a recess in the surface of said valveo the suction side thereof, said recess underlying the embracing member, and a channel connecting said recess with the pressure port, said recess tapering in the direction of movement of said member whereby a fluid wedge is established between the valve and the said member tending to neutralize the effects of the unbalanced pressure appliedat the pressure port.

8. In combination, a cylindrical valve'element supported at one end only and having diametrically spaced ports, a member closely embracing said cylindrical valve androtatable with respect thereto, said member having associated therewith means for applying 'pressure valternately t said` portsand for simultaneously evacuating the opposite port, and recesses in the surface of said valve at the opposite sides thereof from said ports and each connected by a channel with the port at the opposite side of the valve whereby fluid pressure applied to either port is transmitted to the recess at the opposite side of the valve,

said recesses tapering as to depth in the direction of rotation of said embracing member.

9. In combination, a cylindrical valve element supported at one end only and having diametrically spaced ports, a member closely embracing said cylindricall valve and rotatable with respect thereto, said member having associated therewith means for'applying pressure alternately to said' ports and for simu] said recesses tapering in the direction of rotation of said member whereby a fluid wedge is established between the lvalve and said member on the opposite side of said valve from the pressure port.

10. The combination with a cylindrical valve member having ports at opposite sides thereof, and means for supporting saidmember, of a rotary element closely embracing said cylindrical valve and said ports, meansV for applying pressure to one and suction to the other of said ports, a recess in the face of said valve and on the side thereof'opposite the pressure port, and achannel connecting said recess with said pressure, said recess `tapering as to depth in the direction of rotation of said embracing element.

11. The combination with a member having a port therein, of means abutting o posite sides of said member and overlying said port, said member and means being relatively movable, a recess in said member at the side o posfte said port, means' for applying lluld Ipressure to said port, and means connecting4 said port with the recess, said recess tapering as to depth in the direction of the relative movement of said abutting means.

, HENRY w. LANDENBERGER." 

